While I appreciate boxcars etc. being switched by different railroads until they get to their final destination (due to the lack of availability of point-to-point service by the originating railroad), what I've always found fascinating/intriguing is seeing different RR's ENGINES in multiple unit consists travelling across the country together (eg. BNSF & CP engines pulling together in Southern California or UP & CN pulling together in Texas etc. etc.). It's only been in the past few years that I've learned there's an understanding among all railroads that engine use is tracked and a comparable amount of use on the 'other' rr is provided as payback in due course.
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